Let's say we wet MHRB powder in a strong base, such as a NaOH-solution. Swirl it around quite a bit to grant full access to the freebase inside it, and then simply dry it. When dry, it should be theoretically possible to grind and heat the dry mixture of MHRB and lye to 80°C and condense the vapor of the now boiling DMT in a simple water cooler connected to the heating jar. Condensed DMT would generate, as some are familiar with, amorphous DMT (no crystalline structure).
Scrape it up (or collect it in some other way of the cooler), recrystallize the product in naphtha, heptane or another suitable non-polar solvent, and we should have very pure, crystalline DMT.
What are the practical problems with this idea
There's a clear difference between what I say I do and what I actually do perform.